XML 17 R12.htm IDEA: XBRL DOCUMENT v2.3.0.11

Banking Facilities	6 Months Ended
Banking Facilities	Jun. 30, 2011
Banking Facilities
Banking Facilities	8. Banking Facilities

This element represent banking facilities and other debt.

Name:	uslm_BankingFacilitiesAndOtherDebtDisclosureTextBlock
Namespace Prefix:	uslm
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	uslm_BankingFacilitiesDisclosureAbstract
Namespace Prefix:	uslm
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration